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Now showing items 1-10 of 19

#### Effects of translational symmetry breaking induced by the boundaries in a driven diffusive system

(American Physical Society, 1991-04)

We study the effects of the boundary conditions in a driven diffusive lattice-gas model which is known to display kinetic phase transitions. We find, in the case of attractive interaction, that a boundary-condition-induced ...

#### Raman-scattering and optical studies of argon-etched GaAs surfaces

(American Physical Society, 1991-04)

We have studied the structual damage in low-energy argon-ion-bombarded (ion-etched) GaAs using Raman scattering and ultraviolet reflectivity. When combined with post-bombardment sequential chemical etching, the Raman results ...

#### A note on best approximation and invertibility of operators on uniformly convex Banach spaces

(Hindawi Publishing Corp, 1991-01-01)

It is shown that if X is a uniformly convex Banach space and S a bounded linear operator onX for which ?I-S?=1, then S is invertible if and only if ?I-12S? <1. From this it follows thatif S is invertible on X then either ...

#### Hole dynamics and effective hole-hole interaction in a quantum antiferromagnet

(American Physical Society, 1991-04)

By the use of an effective Hamiltonian which takes into account the constraint on the motion of holes in a quantum antiferromagnet, the dynamics of holes is investigated. It is found that there is a quasiparticle band whose ...

#### Optical excitations in Bi2Sr2CuO6 and Bi2Sr2CaCu2O8: Evidence for localized (excitonic) and delocalized charge-transfer gaps

(American Physical Society, 1991-01)

The optical properties of Bi2Sr2CuO6 (2:2:0:1) and Bi2Sr2CaCu2O8 (2:2:1:2) have been investigated by transmission electron-energy-loss spectroscopy. At low energy, E(loss) less-than-or-equal-to 10.0 eV, common features are ...

#### Population stability of a tropical lizard

(Ecological Society of America, 1991-08)

Populations of the lizard Anolis limifrons were censused for 19 yr at the Lutz site on Barro Colorado Island (BCI) and for 4 yr at 20 additional sites in central Panama. Census data provided estimates of population density ...

#### Path-integral approach to the Hubbard model

(American Physical Society, 1991-02)

A path-integral approach to the Hubbard model is developed for the whole range of the coupling strength U. At half filling, the strong-coupling results are readily reproduced within the simple Gaussian fluctuations. The ...

#### Inverse scattering on the line for a Dirac system

(AIP Publishing, 1991-11)

The whole-line version of the Gelfand-Levitan-Marchenko (GLM) equation for a Dirac system is studied. A new derivation of the GLM equation is given, under weaker hypotheses than Frolov's earlier treatment [Sov. Math. Dok1. ...

#### Biological integrity: a long-neglected aspect of water resource management

(Ecological Society of America, 1991-02)

Water of sufficient quality and quantity is critical to all life. Increasing human population and growth of technology require human society to devote more and more attention to protection of adequate supplies of water. ...

#### Power spectrum of the current in systems with a conserved density

(American Physical Society, 1991-09)

Motivated by recent studies of model sandpiles, the power spectrum S of the current in dissipative dynamical systems with a conserved density is investigated. In contrast to self-organized criticality exhibited in certain ...